Who discovered that the atomic mass of elements can vary within the same identity due to changing neutron levels, establishing 'Isotopes'? MCQ with Answer and Explanation

Question

Who discovered that the atomic mass of elements can vary within the same identity due to changing neutron levels, establishing 'Isotopes'?

A. Frederick Soddy

B. James Chadwick

C. J.J. Thomson

D. Ernest Rutherford

Answer: Option A

Solution (By JKSSB Mock Tests)

Soddy introduced the concept of isotopes in 1913, proving that elements can have identical chemical behaviors but different radioactive profiles.

This question belongs to: Static General Knowledge Inventions and Discoveries

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A. Karl Benz

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Correct Answer: Option C

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Who discovered the fundamental principle of chemical thermodynamics relating free energy, enthalpy, and entropy?

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Correct Answer: Option B

Explanation:
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Who discovered that atomic electronic distributions can be mapped inside multi-dimensional coordinate grids, formulating Matrix Mechanics?

A. Wolfgang Pauli

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Correct Answer: Option B

Explanation:
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